In spite of improvements in pollution control,there is still a need for concern over the health of the Great Lakes ecosystem because of biological magnification.

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Biological magnification is the process where pollutants become more concentrated as they move up the food chain, causing greater harm to top predators such as fish and birds. This can have negative impacts on the overall health of the Great Lakes ecosystem, despite improvements in pollution control measures.

In Spite of Improvements in Pollution Control,there Is Still a Need